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Just one of these functions is analytic everywhere in the plane. Which?

  • A.\( |z| \)
  • B.\( e^{z} \)
  • C.\( \bar{z} \)
  • D.\( 1/z \)

Answer: B

The exponential satisfies the Cauchy-Riemann equations at every point and is its own derivative, so it is entire. The conjugate fails them everywhere, the reciprocal fails at the origin, and the modulus is real-valued and non-constant, which no analytic function can be

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